Battery state of charge reset

Patent metadata

Field	Value
Publication number	US-2020122584-A1
Application number	US-201816164046-A
Country	US
Kind code	A1
Filing date	Oct 18, 2018
Priority date	Oct 18, 2018
Publication date	Apr 23, 2020
Grant date	—

Abstract

A system for a vehicle including a traction battery, electrical loads, and a controller configured to, during a charge operation, activate the loads such that charge current output by a charger is consumed by the loads and charge current input to the battery approaches zero to update a state of charge (SOC) value of the battery, and deactivate the loads upon completion of the update such that charge current input to the battery increases.

First claim

What is claimed is:

1 . A system for a vehicle comprising:
a traction battery; electrical loads; and a controller configured to, during a charge operation,
activate the loads such that charge current output by a charger is consumed by the loads and charge current input to the battery approaches zero to update a state of charge (SOC) value of the battery, and
deactivate the loads upon completion of the update such that charge current input to the battery increases.

2 . The system of claim 1 , wherein the activating is in response to a difference between a model-estimated SOC value and an integration-estimated SOC value being greater than a difference threshold.

3 . The system of claim 2 , wherein the activating is further in response to each of the estimated SOC values being less than an SOC threshold.

4 . The system of claim 1 , wherein the charge current consumed by the loads is based on a running average of the currents consumed over a predefined period.

5 . The system of claim 1 , wherein the controller is further configured to reduce charge current output by the charger to correspond to charge current needed to operate the loads.

6 . The system of claim 5 , wherein the reduced charge current output by the charger corresponds to an active charging threshold.

7 . A charging system for a vehicle comprising:
a controller configured to, during a charge operation,
reduce charge current output by a charger to a non-zero value such that charge current input to a traction battery approaches zero to update a state of charge value of the battery, and
increase, upon completion of the update, the charge current output by the charger such that charge current input to the battery increases.

8 . The system of claim 7 , wherein the reduced charge current corresponds to an active charging threshold.

9 . The system of claim 7 , wherein the reducing is responsive to a difference between a model-estimated SOC value and an integration-estimated SOC value being greater than a difference threshold.

10 . The system of claim 7 , wherein the controller is further configured to activate electrical loads of the vehicle such that the reduced charge current is consumed by the loads.

11 . The system of claim 10 , wherein the reducing is based on a running average of the currents consumed over a predefined period.

12 . The system of claim 10 , wherein the controller is further configured to deactivate the loads upon completion of the update.

13 . A system for a vehicle comprising:
a traction battery and an A/C compressor; and a controller configured to, during a charge operation,
reduce battery charger output such that the output is consumed by the compressor and does not charge the battery to update a state of charge (SOC) value of the battery, and
increase, upon completion of the update, the output to charge the battery.

14 . The system of claim 13 , wherein the reducing is in response to a difference between a model estimated SOC value and an integration-estimated SOC value being greater than a difference threshold.

15 . The system of claim 14 , wherein the reducing is further in response to each of the estimated SOC values being less than an SOC threshold.

16 . The system of claim 13 , wherein charge current consumed by the compressor is based on a running average of charge current consumed over a predefined period.

17 . The system of claim 13 , wherein, prior to the reducing, the controller is further configured to activate a DC/DC converter of the vehicle such that the output is consumed by the compressor and charge current to the battery approaches zero.

18 . The system of claim 17 , wherein the controller is further configured to, upon completion of the update, deactivate the compressor.

Assignees

• Ford Global Tech Llc

Inventors

• Zhang Yuan
• Wang Rui
• Wang Xu

Classifications

• B60L2210/10

  DC to DC converters · CPC title

• B60L53/14

  Conductive energy transfer · CPC title

• B60Y2200/91

  Electric vehicles · CPC title

• B60L58/12 Primary

  responding to state of charge [SoC] · CPC title

• B60H1/3205

  Control means therefor · CPC title